varnish-sys 0.0.14

Bindings to the Varnish Cache libraries
Documentation 
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use std::env;
use std::path::PathBuf;

fn main() {
    println!("cargo:rustc-link-lib=varnishapi");
    let out_path = PathBuf::from(env::var("OUT_DIR").unwrap()).join("bindings.rs");

    println!("cargo:rerun-if-env-changed=VARNISH_INCLUDE_PATHS");
    let varnish_paths: Vec<PathBuf> = match env::var("VARNISH_INCLUDE_PATHS") {
        Ok(s) => s.split(":").map(PathBuf::from).collect(),
        Err(_) => {
            match pkg_config::Config::new()
                .atleast_version("7.2")
                .probe("varnishapi")
            {
                Ok(l) => l.include_paths,
                Err(e) => {
                    println!(
                        "no system libvarnish found, using the pre-generated bindings {}",
                        e
                    );
                    std::fs::copy("src/bindings.rs.saved", out_path).unwrap();
                    return;
                }
            }
        }
    };

    println!("cargo:rerun-if-changed=src/wrapper.h");
    let bindings = bindgen::Builder::default()
        .header("src/wrapper.h")
        .blocklist_item("FP_.*")
        .parse_callbacks(Box::new(bindgen::CargoCallbacks))
        .clang_args(
            varnish_paths
                .iter()
                .map(|i| format!("-I{}", i.to_str().unwrap())),
        )
        .derive_copy(true)
        .derive_debug(true)
        .derive_default(true)
        .generate()
        .expect("Unable to generate bindings");

    // Write the bindings to the $OUT_DIR/bindings.rs file.
    bindings
        .write_to_file(out_path)
        .expect("Couldn't write bindings!");
}